After the events in "Olivia Goes West", Nellie Brie has moved to London to live with Basil. However, Nellie finds the transition difficult, being unable to find a newspaper that will hire her, while Basil feels his career has hit a dead end. Meanwhile, a new menace stirs in America, and even with Ratigan gone, the couple will find that they have more than enough enemies...

A year has passed since Basil's battle with Ratigan atop Big Ben, and the Flavershams have moved to the American West to put that horror behind them. However, once arriving in Green River, Olivia's father is kidnapped once again. Can Olivia hone her detective skills to save him? Luckily, she'll get a little help from one Fievel Mousekewitz! (Sequel to Basil's American Tail).

In 1886, Basil of Baker Street, fresh off of busting Ratigan's latest heist at the British Museum, travels to New York City in search of stolen artifacts which he discovered had been sold on the black market. Upon his arrival he's assigned someone from the NYPD to be his body guard, who, as Basil deduces, is actually a woman in disguise, a reporter named Nellie Brie.